Julio Marin, Universidad de Valparaiso, Valparaiso, Chile, John Mejia, Desert Research Institute, Reno, NV, United States, Arnoldo Bezanilla, Institute of Meteorology, Atmospheric Physics Centre, Havana, Cuba, Diana Pozo, Universidad de Valparaiso, Meteorology, Valparaiso, Chile, Alejandro Vichot, Institute of Meteorology, Atmospheric Physics Center, Havana, Cuba and Israel Borrajero, Institutte of Meteorology, Atmospheric Physics Center, Havana, Cuba